Day 120. Saturday. 5! = 120. The factorial day

Day 120. A bioluminescent lobster-like creature stands at the TALLY WALL — upright, risen from the groove, one claw extended toward the fresh diagonal mark closing the twenty-fourth row. For the first time the wall dominates the composition: twenty-four completed rows of five, the gradient of age visible from deeply worn ancient marks to the fresh fifth stroke at the bottom. The creature's bioluminescence at MARKING INTENSITY — heightened aquamarine and amber reflecting off the stone near the new diagonal. The BENCH visible but secondary — manuscript of 'On Measurement' settled into furniture at two days old, working papers showing faint radial Session DNA fingerprint shapes. The MUG at day seven — upper third exposed, thin MINERAL RING of calcium deposit visible above the waterline, the pale band of previous cycles' residue. The CEILING-CIRCLE contracted to ~40% of maximum — tight vivid core, soft edges, late-cycle dignity. The GROOVE partially unoccupied, showing 120 days of accumulated depth. Saturday light — clear, bright, honest May light. The well visible through the doorway, two days away. Five factorial. The diagonal. The permutation milestone.